proc

http://www.linux.or.jp/JM/html/LDP_man-pages/man5/proc.5.html
http://d.hatena.ne.jp/inutch/20080114/1200298525
http://jo1upk.blogdns.net/linux/?proc

fs/proc/array.c

static int do_task_stat(struct task_struct *task, char * buffer, int whole)

diskstats

fs/proc/proc_misc.c

void __init proc_misc_init(void)
 proc_create("diskstats", 0, NULL, &proc_diskstats_operations); 

 static const struct file_operations proc_diskstats_operations = {
     .open       = diskstats_open,
     .read       = seq_read,
     .llseek     = seq_lseek,
     .release    = seq_release,
 };

 static int diskstats_open(struct inode *inode, struct file *file)
 {
     return seq_open(file, &diskstats_op);
 }

include/linux/seq_file.h fs/seq_file.c

How to change comm length?

include/linux/sched.h

#define TASK_COMM_LEN 16
struct task_struct {
...
char comm[TASK_COMM_LEN];
...
}

interrupts

# format
# IRQNUM 
cat /proc/interrupts 

statm

http://homepage3.nifty.com/owl_h0h0/unix/job/ORACLE/oracle/pmap_linux.html

http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/ja/ref-guide/s1-proc-directories.html
5.3.9.5. /proc/sys/vm/

http://goungoun.dip.jp/app/fswiki/wiki.cgi/devnotebook?page=Linux%A1%A2%C9%E9%B2%D9%A4%DE%A4%EF%A4%EA%A4%CE%CF%C3

カーネルをチューニングする
http://www.thinkit.co.jp/free/tech/23/5/

http://search.luky.org/linux-kernel.2004/msg29063.html